Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-03-22
Phys. Rev. B 81, 224413 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 9 figures, published version. Expanded section on dynamics + new short section on general J3a,J3b combinations + oth
Scientific paper
10.1103/PhysRevB.81.224413
We discuss the origin of spin correlations observed in neutron scattering experiments on the paramagnetic phase of a number of frustrated spinel compounds, most notably ZnCr2O4. These correlations are striking for two reasons. First, they have been interpreted as evidence for the formation of weakly interacting hexagonal clusters of spins. Second, they are very different from those calculated for the nearest neighbour Heisenberg pyrochlore antiferromagnet, in which Coulomb phase correlations generate sharp scattering features known as pinch points. Using large-$n$ calculations and Monte Carlo simulations, we show that very weak further neighbour exchange interactions can account for both the apparent formation of clusters and the suppression of pinch points.
Chalker John T.
Conlon P. H.
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